I'd had an idea in the past for a futuristic RP based on Esperanto (which I speak) along the lines of how it appears in Harry Harrison's books. 

Could be that there is a small group of people/ship who have dedicated themselves to international relations on-ship/inter-ship - translators/diplomacy. So they have in effect renounced statehood in order to try and keep everything together, acting as go-betweens. Perhaps even a hospital ship or dedicated neutral zone?

Must confess I don't know if this forum has rules about posting language so it might not work, unless
I always post a translation. 

Either that or perhaps a xenolinguist who tries to communicate with the aliens?

Apologies for vagueness but I'm just going offline for a bit so I wanted to get some thoughts down. I'll have a proper read of the thread in a bit.